Server-client determination

ABSTRACT

Systems, methods, and computer-readable media are provided for determining whether a node in a network is a server or a client. In some examples, a system can collect, from one or more sensors that monitor at least part of data traffic being transmitted via a pair of nodes in a network, information of the data traffic. The system can analyze attributes of the data traffic such as timing, port magnitude, degree of communication, historical data, etc. Based on analysis results and a predetermined rule associated with the attributes, the system can determine which node of the pair of nodes is a client and which node is a server.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No. 15/140,395, entitled “SERVER-CLIENT DETERMINATION,” filed on Apr. 27, 2016, which in turn, claims priority to U.S. Provisional Application No. 62,171,899, filed on Jun. 5, 2015, both of which are incorporated herein by reference in their entirety.

TECHNICAL FIELD

The present technology pertains to network analytics, and more specifically to detecting servers and clients in a network environment.

BACKGROUND

A modern computer network comprises a large amount of highly distributed nodes and data. The highly distributed data can be very difficult to be collected and analyzed. Further, information gathered from the highly distributed throughout the network is often limited and may not include certain types of useful information. For example, data traffic may not always include identifications of the node's server-client status. Thus, there is a need to make an estimate or inference as to the server-client status of a network node based on gathered data traffic information.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to describe the manner in which the above-recited and other advantages and features of the disclosure can be obtained, a more particular description of the principles briefly described above will be rendered by reference to specific examples thereof, which are illustrated in the appended drawings. Understanding that these drawings depict only exemplary examples of the disclosure and are not therefore to be considered to be limiting of its scope, the principles herein are described and explained with additional specificity and detail through the use of the accompanying drawings in which:

FIG. 1 illustrates a diagram of an example network environment, according to some examples;

FIG. 2A illustrates a schematic diagram of an example sensor deployment in a virtualized environment, according to some examples;

FIG. 2B illustrates a schematic diagram of an example sensor deployment in an example network device, according to some examples;

FIG. 2C illustrates a schematic diagram of an example reporting system in an example sensor topology, according to some examples;

FIG. 3 illustrates a sequence diagram of an example communication between network nodes, according to some examples;

FIG. 4 illustrates a schematic diagram of example nodes with respective degrees of communication, according to some examples;

FIGS. 5A-5C illustrate schematic diagrams of example nodes and propagating information throughout a graph, according to some examples;

FIG. 6 illustrates an example method embodiment for determining a server-client relationship, according to some examples;

FIG. 7 illustrates another example method embodiment for determining a server-client relationship, according to some examples;

FIG. 8 illustrates yet another example method embodiment for determining a server-client relationship, according to some examples;

FIG. 9 illustrates an example network device, according to some examples; and

FIGS. 10A and 10B illustrate example system examples.

DESCRIPTION OF EXAMPLES

Various examples of the disclosure are discussed in detail below. While specific implementations are discussed, it should be understood that this is done for illustration purposes only. A person skilled in the relevant art will recognize that other components and configurations may be used without parting from the spirit and scope of the disclosure.

Overview

Additional features and advantages of the disclosure will be set forth in the description which follows. The features and advantages of the disclosure can be realized and obtained by means of the instruments and combinations particularly pointed out in the appended claims. These and other features of the disclosure will become more fully apparent from the following description and appended claims, or can be learned by the practice of the principles set forth herein.

The approaches set forth herein can be used to deploy sensors in a network environment, and analyze data collected from the sensors to monitor and troubleshoot the network. For examples, sensors can be placed at various devices or components in the network to collect flow data and network statistics from various network nodes such as servers and clients. The data collected from the sensors can provide valuable details about the status, security, or performance of the network, as well as any network elements. Information about the sensors can also help interpret the data from the sensors, in order to infer or ascertain additional details from the collected data. For example, understanding the placement of a sensor relative to other sensors in the network can provide a context to the data reported by the sensors, which can further help identify specific patterns or conditions in the network.

Some examples can determine, based upon network data collected from sensors in the network, which of a pair of network nodes is a server and which node is a client in communication between the two nodes. A server is typically a computing device or software that waits for requests from other computing devices or software (i.e., clients) and responds to them. A client is a computing device or software that accesses a service made available by the server. The server and the client may each have an address such as an Internet Protocol (IP) address associated with them. They may also each communicate through a specific port. The sensors can be packet inspection sensors or capturing agents configured to monitor, capture, and/or report network traffic information at various locations in the network. The sensors can be deployed on virtual machines, hypervisors, servers, and network devices (e.g., physical switches) on the network. The various sensors can capture traffic from their respective locations (e.g., traffic processed by their hosts), and report captured data to one or more devices, such as a collector system or a processing engine. The captured data can include any traffic and/or process information captured by the sensors including reports or control flows generated by other sensors.

The data and information reported from the various sensors can include various attributes of the captured or monitored data traffic. The reported information can be used to determine which node is the client and which node is the server. In particular, one or more rules can be employed to make this determination. For example, the rules may dictate that when certain attributes, such as timing, magnitude, degree, etc., meet a predetermined condition, a given node is more likely to be a client than a server, and vice versa.

In some examples, the system can collect information about data traffic between a pair of nodes from one or more sensors that monitor at least part of that data traffic. Based on the information, the system can analyze attributes of the data traffic such as timing, port magnitude, degree of communication, historical data, etc. Based on the analysis and a predetermined rule associated with the attributes, the system can determine which node of the pair of nodes is a client and which node is a server. For example, the rules may assume that the client is more likely than the server to initiate a communication. The rules may also assume that the server may establish more connections, than the client, with other devices (i.e., higher degree of communication). Moreover, the rules may assume that the server is more likely to use a lower-numbered port than the client. By applying these rules to the information gathered from the sensors, the system can make an educated guess as to whether a given node is a server or a client. In addition, these findings and/or information (e.g., data traffic) of known server/client pairs can be used as training data for a series of machine learning tasks to create one or more classifiers. Graph consistency techniques can also utilize earlier determined server-client statuses to make further determinations throughout a communication graph of the network by propagating the information.

Detailed Description

The disclosed technology addresses the need in the art for determining whether a monitored network node is a server or a client. Disclosed are systems, methods, and computer-readable storage media for determining a server-client relationship in a network based on information collected by one or more sensors. A description of an example network environment, as illustrated in FIG. 1, is first disclosed herein. A discussion of sensors and sensor topologies in virtualized environments, as illustrated in FIGS. 2A-C, will then follow. The discussion follows with a discussion of mechanisms for determining server-client relationships, as illustrated in FIGS. 3-5. Then, example methods practiced according to the various examples disclosed herein will be discussed, as illustrated in FIGS. 6-8. The discussion then concludes with a description of example devices, as illustrated in FIGS. 9 and 10A-B. These variations shall be described herein as the various examples are set forth. The disclosure now turns to FIG. 1.

FIG. 1 illustrates a diagram of example network environment 100. Fabric 112 can represent the underlay (i.e., physical network) of network environment 100. Fabric 112 can include spine routers 1-N (102 _(A-N)) (collectively “102”) and leaf routers 1-N (104 _(A-N)) (collectively “104”). Leaf routers 104 can reside at the edge of fabric 112, and can thus represent the physical network edges. Leaf routers 104 can be, for example, top-of-rack (“ToR”) switches, aggregation switches, gateways, ingress and/or egress switches, provider edge devices, and/or any other type of routing or switching device.

Leaf routers 104 can be responsible for routing and/or bridging tenant or endpoint packets and applying network policies. Spine routers 102 can perform switching and routing within fabric 112. Thus, network connectivity in fabric 112 can flow from spine routers 102 to leaf routers 104, and vice versa.

Leaf routers 104 can provide servers 1-5 (106 _(A-E)) (collectively “106”), hypervisors 1-4 (108 _(A)-108 _(D)) (collectively “108”), and virtual machines (VMs) 1-5 (110 _(A)-110 _(E)) (collectively “110”) access to fabric 112. For example, leaf routers 104 can encapsulate and decapsulate packets to and from servers 106 in order to enable communications throughout environment 100. Leaf routers 104 can also connect other devices, such as device 114, with fabric 112. Device 114 can be any network-capable device(s) or network(s), such as a firewall, a database, a server, a collector 118 (further described below), an engine 120 (further described below), etc. Leaf routers 104 can also provide any other servers, resources, endpoints, external networks, VMs, services, tenants, or workloads with access to fabric 112.

VMs 110 can be virtual machines hosted by hypervisors 108 running on servers 106. VMs 110 can include workloads running on a guest operating system on a respective server. Hypervisors 108 can provide a layer of software, firmware, and/or hardware that creates and runs the VMs 110. Hypervisors 108 can allow VMs 110 to share hardware resources on servers 106, and the hardware resources on servers 106 to appear as multiple, separate hardware platforms. Moreover, hypervisors 108 and servers 106 can host one or more VMs 110. For example, server 106 _(A) and hypervisor 108 _(A) can host VMs 110 _(A-B).

In some cases, VMs 110 and/or hypervisors 108 can be migrated to other servers 106. For example, VM 110 _(A) can be migrated to server 106 _(C) and hypervisor 108 _(B). Servers 106 can similarly be migrated to other locations in network environment 100. For example, a server connected to a specific leaf router can be changed to connect to a different or additional leaf router. In some cases, some or all of servers 106, hypervisors 108, and/or VMs 110 can represent tenant space. Tenant space can include workloads, services, applications, devices, and/or resources that are associated with one or more clients or subscribers. Accordingly, traffic in network environment 100 can be routed based on specific tenant policies, spaces, agreements, configurations, etc. Moreover, addressing can vary between one or more tenants. In some configurations, tenant spaces can be divided into logical segments and/or networks and separated from logical segments and/or networks associated with other tenants.

Any of leaf routers 104, servers 106, hypervisors 108, and VMs 110 can include sensor 116 (also referred to as a “sensor”) configured to capture network data, and report any portion of the captured data to collector 118. Sensors 116 can be processes, agents, modules, drivers, or components deployed on a respective system (e.g., a server, VM, hypervisor, leaf router, etc.), configured to capture network data for the respective system (e.g., data received or transmitted by the respective system), and report some or all of the captured data to collector 118.

For example, a VM sensor can run as a process, kernel module, or kernel driver on the guest operating system installed in a VM and configured to capture data (e.g., network and/or system data) processed (e.g., sent, received, generated, etc.) by the VM. Additionally, a hypervisor sensor can run as a process, kernel module, or kernel driver on the host operating system installed at the hypervisor layer and configured to capture data (e.g., network and/or system data) processed (e.g., sent, received, generated, etc.) by the hypervisor. A server sensor can run as a process, kernel module, or kernel driver on the host operating system of a server and configured to capture data (e.g., network and/or system data) processed (e.g., sent, received, generated, etc.) by the server. And a network device sensor can run as a process or component in a network device, such as leaf routers 104, and configured to capture data (e.g., network and/or system data) processed (e.g., sent, received, generated, etc.) by the network device.

Sensors 116 or sensors can be configured to report the observed data and/or metadata about one or more packets, flows, communications, processes, events, and/or activities to collector 118. For example, sensors 116 can capture network data as well as information about the system or host of the sensors 116 (e.g., where the sensors 116 are deployed). Such information can also include, for example, data or metadata of active or previously active processes of the system, operating system user identifiers, metadata of files on the system, system alerts, networking information, etc. sensors 116 may also analyze all the processes running on the respective VMs, hypervisors, servers, or network devices to determine specifically which process is responsible for a particular flow of network traffic. Similarly, sensors 116 may determine which operating system user(s) is responsible for a given flow. Reported data from sensors 116 can provide details or statistics particular to one or more tenants. For example, reported data from a subset of sensors 116 deployed throughout devices or elements in a tenant space can provide information about the performance, use, quality, events, processes, security status, characteristics, statistics, patterns, conditions, configurations, topology, and/or any other information for the particular tenant space.

Collectors 118 can be one or more devices, modules, workloads and/or processes capable of receiving data from sensors 116. Collectors 118 can thus collect reports and data from sensors 116. Collectors 118 can be deployed anywhere in network environment 100 and/or even on remote networks capable of communicating with network environment 100. For example, one or more collectors can be deployed within fabric 112 or on one or more of the servers 106. One or more collectors can be deployed outside of fabric 112 but connected to one or more leaf routers 104. Collectors 118 can be part of servers 106 and/or separate servers or devices (e.g., device 114). Collectors 118 can also be implemented in a cluster of servers.

Collectors 118 can be configured to collect data from sensors 116. In addition, collectors 118 can be implemented in one or more servers in a distributed fashion. As previously noted, collectors 118 can include one or more collectors. Moreover, each collector can be configured to receive reported data from all sensors 116 or a subset of sensors 116. For example, a collector can be assigned to a subset of sensors 116 so the data received by that specific collector is limited to data from the subset of sensors.

Collectors 118 can be configured to aggregate data from all sensors 116 and/or a subset of sensors 116. Moreover, collectors 118 can be configured to analyze some or all of the data reported by sensors 116. For example, collectors 118 can include analytics engines (e.g., engines 120) for analyzing collected data. Environment 100 can also include separate analytics engines 120 configured to analyze the data reported to collectors 118. For example, engines 120 can be configured to receive collected data from collectors 118 and aggregate the data, analyze the data (individually and/or aggregated), generate reports, identify conditions, compute statistics, visualize reported data, troubleshoot conditions, visualize the network and/or portions of the network (e.g., a tenant space), generate alerts, identify patterns, calculate misconfigurations, identify errors, generate suggestions, generate testing, and/or perform any other analytics functions.

While collectors 118 and engines 120 are shown as separate entities, this is for illustration purposes as other configurations are also contemplated herein. For example, any of collectors 118 and engines 120 can be part of a same or separate entity. Moreover, any of the collector, aggregation, and analytics functions can be implemented by one entity (e.g., collectors 118) or separately implemented by multiple entities (e.g., engine 120 and/or collectors 118).

Each of the sensors 116 can use a respective address (e.g., internet protocol (IP) address, port number, etc.) of their host to send information to collectors 118 and/or any other destination. Collectors 118 may also be associated with their respective addresses such as IP addresses. Moreover, sensors 116 can periodically send information about flows they observe to collectors 118. sensors 116 can be configured to report each and every flow they observe. Sensors 116 can report a list of flows that were active during a period of time (e.g., between the current time and the time of the last report). The consecutive periods of time of observance can be represented as pre-defined or adjustable time series. The series can be adjusted to a specific level of granularity. Thus, the time periods can be adjusted to control the level of details in statistics and can be customized based on specific requirements, such as security, scalability, storage, etc. The time series information can also be implemented to focus on more important flows or components (e.g., VMs) by varying the time intervals. The communication channel between a sensor and collector 118 can also create a flow in every reporting interval. Thus, the information transmitted or reported by sensors 116 can also include information about the flow created by the communication channel.

FIG. 2A illustrates a schematic diagram of an example sensor deployment 200 in a virtualized environment. Server 106 _(A) can execute and host one or more VMs 202 _(A-C) (collectively “202”). VMs 202 _(A-C) can be similar to VMs 110 _(A-E) of FIG. 1. For example, VM 1 (202 _(A)) of FIG. 2A can be VM 1 (110 _(A)) of FIG. 1, and so forth. VMs 202 can be configured to run workloads (e.g., applications, services, processes, functions, etc.) based on hardware resources 212 on server 106 _(A). VMs 202 can run on guest operating systems 206 _(AC) (collectively “206”) on a virtual operating platform provided by hypervisor 208. Each VM 202 can run a respective guest operating system 206 which can be the same or different as other guest operating systems 206 associated with other VMs 202 on server 106 _(A). Each of guest operating systems 206 can execute one or more processes, which may in turn be programs, applications, modules, drivers, services, widgets, etc. Each of guest operating systems 206 may also be associated with one or more user accounts. For example, many popular operating systems such as LINUX, UNIX, WINDOWS, MAC OS, etc., offer multi-user environments where one or more users can use the system concurrently and share software/hardware resources. One or more users can sign in or log in to their user accounts associated with the operating system and run various workloads. Moreover, each VM 202 can have one or more network addresses, such as an internet protocol (IP) address. VMs 202 can thus communicate with hypervisor 208, server 106 _(A), and/or any remote devices or networks using the one or more network addresses.

Hypervisor 208 (otherwise known as a virtual machine monitor) can be a layer of software, firmware, and/or hardware that creates and runs VMs 202. Guest operating systems 206 running on VMs 202 can share virtualized hardware resources created by hypervisor 208. The virtualized hardware resources can provide the illusion of separate hardware components. Moreover, the virtualized hardware resources can perform as physical hardware components (e.g., memory, storage, processor, network interface, etc.), and can be driven by hardware resources 212 on server 106 _(A). Hypervisor 208 can have one or more network addresses, such as an internet protocol (IP) address, to communicate with other devices, components, or networks. For example, hypervisor 208 can have a dedicated IP address which it can use to communicate with VMs 202, server 106 _(A), and/or any remote devices or networks.

Hardware resources 212 of server 106 _(A) can provide the underlying physical hardware that drive operations and functionalities provided by server 106 _(A), hypervisor 208, and VMs 202. Hardware resources 212 can include, for example, one or more memory resources, one or more storage resources, one or more communication interfaces, one or more processors, one or more circuit boards, one or more buses, one or more extension cards, one or more power supplies, one or more antennas, one or more peripheral components, etc. Additional examples of hardware resources are described below with reference to FIGS. 10 and 11A-B.

Server 106 _(A) can also include one or more host operating systems (not shown). The number of host operating system can vary by configuration. For example, some configurations can include a dual boot configuration that allows server 106 _(A) to boot into one of multiple host operating systems. In other configurations, server 106 _(A) may run a single host operating system. Host operating systems can run on hardware resources 212. In some cases, hypervisor 208 can run on, or utilize, a host operating system on server 106 _(A). Each of the host operating systems can execute one or more processes, which may be programs, applications, modules, drivers, services, widgets, etc. Each of the host operating systems may also be associated with one or more OS user accounts.

Server 106 _(A) can also have one or more network addresses, such as an internet protocol (IP) address, to communicate with other devices, components, or networks. For example, server 106 _(A) can have an IP address assigned to a communications interface from hardware resources 212, which it can use to communicate with VMs 202, hypervisor 208, leaf router 104 _(A) in FIG. 1, collectors 118 in FIG. 1, and/or any remote devices or networks.

VM sensors 204 _(A-C) (collectively “204”) can be deployed on one or more of VMs 202. VM sensors 204 can be data and packet inspection agents or sensors deployed on VMs 202 to capture packets, flows, processes, events, traffic, and/or any data flowing into, out of, or through VMs 202. VM sensors 204 can be configured to export or report any data collected or captured by the sensors 204 to a remote entity, such as collectors 118, for example. VM sensors 204 can communicate or report such data using a network address of the respective VMs 202 (e.g., VM IP address).

VM sensors 204 can capture and report any traffic (e.g., packets, flows, etc.) sent, received, generated, and/or processed by VMs 202. For example, sensors 204 can report every packet or flow of communication sent and received by VMs 202. Such communication channel between sensors 204 and collectors 108 creates a flow in every monitoring period or interval and the flow generated by sensors 204 may be denoted as a control flow. Moreover, any communication sent or received by VMs 202, including data reported from sensors 204, can create a network flow. VM sensors 204 can report such flows in the form of a control flow to a remote device, such as collectors 118 illustrated in FIG. 1. VM sensors 204 can report each flow separately or aggregated with other flows. When reporting a flow via a control flow, VM sensors 204 can include a sensor identifier that identifies sensors 204 as reporting the associated flow. VM sensors 204 can also include in the control flow a flow identifier, an IP address, a timestamp, metadata, a process ID, an OS username associated with the process ID, and any other information, as further described below. In addition, sensors 204 can append the process and user information (i.e., which process and/or user is associated with a particular flow) to the control flow. The additional information as identified above can be applied to the control flow as labels. Alternatively, the additional information can be included as part of a header, a trailer, or a payload.

VM sensors 204 can also report multiple flows as a set of flows. When reporting a set of flows, VM sensors 204 can include a flow identifier for the set of flows and/or a flow identifier for each flow in the set of flows. VM sensors 204 can also include one or more timestamps and other information as previously explained.

VM sensors 204 can run as a process, kernel module, or kernel driver on guest operating systems 206 of VMs 202. VM sensors 204 can thus monitor any traffic sent, received, or processed by VMs 202, any processes running on guest operating systems 206, any users and user activities on guest operating system 206, any workloads on VMs 202, etc.

Hypervisor sensor 210 can be deployed on hypervisor 208. Hypervisor sensor 210 can be a data inspection agent or a sensor deployed on hypervisor 208 to capture traffic (e.g., packets, flows, etc.) and/or data flowing through hypervisor 208. Hypervisor sensor 210 can be configured to export or report any data collected or captured by hypervisor sensor 210 to a remote entity, such as collectors 118, for example. Hypervisor sensor 210 can communicate or report such data using a network address of hypervisor 208, such as an IP address of hypervisor 208.

Because hypervisor 208 can see traffic and data originating from VMs 202, hypervisor sensor 210 can also capture and report any data (e.g., traffic data) associated with VMs 202. For example, hypervisor sensor 210 can report every packet or flow of communication sent or received by VMs 202 and/or VM sensors 204. Moreover, any communication sent or received by hypervisor 208, including data reported from hypervisor sensor 210, can create a network flow. Hypervisor sensor 210 can report such flows in the form of a control flow to a remote device, such as collectors 118 illustrated in FIG. 1. Hypervisor sensor 210 can report each flow separately and/or in combination with other flows or data. When reporting a flow, hypervisor sensor 210 can include a sensor identifier that identifies hypervisor sensor 210 as reporting the flow. Hypervisor sensor 210 can also include in the control flow a flow identifier, an IP address, a timestamp, metadata, a process ID, and any other information, as explained below. In addition, sensors 210 can append the process and user information (i.e., which process and/or user is associated with a particular flow) to the control flow. The additional information as identified above can be applied to the control flow as labels. Alternatively, the additional information can be included as part of a header, a trailer, or a payload.

Hypervisor sensor 210 can also report multiple flows as a set of flows. When reporting a set of flows, hypervisor sensor 210 can include a flow identifier for the set of flows and/or a flow identifier for each flow in the set of flows. Hypervisor sensor 210 can also include one or more timestamps and other information as previously explained, such as process and user information.

As previously explained, any communication captured or reported by VM sensors 204 can flow through hypervisor 208. Thus, hypervisor sensor 210 can observe and capture any flows or packets reported by VM sensors 204, including any control flows. Accordingly, hypervisor sensor 210 can also report any packets or flows reported by VM sensors 204 and any control flows generated by VM sensors 204. For example, VM sensor 204 _(A) on VM 1 (202 _(A)) captures flow 1 (“F1”) and reports F1 to collector 118 on FIG. 1. Hypervisor sensor 210 on hypervisor 208 can also see and capture F1, as F1 would traverse hypervisor 208 when being sent or received by VM 1 (202 _(A)). Accordingly, hypervisor sensor 210 on hypervisor 208 can also report F1 to collector 118. Thus, collector 118 can receive a report of F1 from VM sensor 204 _(A) on VM 1 (202 _(A)) and another report of F1 from hypervisor sensor 210 on hypervisor 208.

When reporting F1, hypervisor sensor 210 can report F1 as a message or report that is separate from the message or report of F1 transmitted by VM sensor 204 _(A) on VM 1 (202 _(A)). However, hypervisor sensor 210 can also, or otherwise, report F1 as a message or report that includes or appends the message or report of F1 transmitted by VM sensor 204 _(A) on VM 1 (202 _(A)). In other words, hypervisor sensor 210 can report F1 as a separate message or report from VM sensor 204 _(A)'s message or report of F1, and/or a same message or report that includes both a report of F1 by hypervisor sensor 210 and the report of F1 by VM sensor 204 _(A) at VM 1 (202 _(A)). In this way, VM sensors 204 at VMs 202 can report packets or flows received or sent by VMs 202, and hypervisor sensor 210 at hypervisor 208 can report packets or flows received or sent by hypervisor 208, including any flows or packets received or sent by VMs 202 and/or reported by VM sensors 204.

Hypervisor sensor 210 can run as a process, kernel module, or kernel driver on the host operating system associated with hypervisor 208. Hypervisor sensor 210 can thus monitor any traffic sent and received by hypervisor 208, any processes associated with hypervisor 208, etc.

Server 106 _(A) can also have server sensor 214 running on it. Server sensor 214 can be a data inspection agent or sensor deployed on server 106 _(A) to capture data (e.g., packets, flows, traffic data, etc.) on server 106 _(A). Server sensor 214 can be configured to export or report any data collected or captured by server sensor 214 to a remote entity, such as collector 118, for example. Server sensor 214 can communicate or report such data using a network address of server 106 _(A), such as an IP address of server 106 _(A).

Server sensor 214 can capture and report any packet or flow of communication associated with server 106 _(A). For example, sensor 216 can report every packet or flow of communication sent or received by one or more communication interfaces of server 106 _(A). Moreover, any communication sent or received by server 106 _(A), including data reported from sensors 204 and 210, can create a network flow associated with server 106 _(A). Server sensor 214 can report such flows in the form of a control flow to a remote device, such as collector 118 illustrated in FIG. 1. Server sensor 214 can report each flow separately or in combination. When reporting a flow, server sensor 214 can include a sensor identifier that identifies server sensor 214 as reporting the associated flow. Server sensor 214 can also include in the control flow a flow identifier, an IP address, a timestamp, metadata, a process ID, and any other information. In addition, sensor 214 can append the process and user information (i.e., which process and/or user is associated with a particular flow) to the control flow. The additional information as identified above can be applied to the control flow as labels. Alternatively, the additional information can be included as part of a header, a trailer, or a payload.

Server sensor 214 can also report multiple flows as a set of flows. When reporting a set of flows, server sensor 214 can include a flow identifier for the set of flows and/or a flow identifier for each flow in the set of flows. Server sensor 214 can also include one or more timestamps and other information as previously explained.

Any communications captured or reported by sensors 204 and 210 can flow through server 106 _(A). Thus, server sensor 214 can observe or capture any flows or packets reported by sensors 204 and 210. In other words, network data observed by sensors 204 and 210 inside VMs 202 and hypervisor 208 can be a subset of the data observed by server sensor 214 on server 106 _(A). Accordingly, server sensor 214 can report any packets or flows reported by sensors 204 and 210 and any control flows generated by sensors 204 and 210. For example, sensor 204 _(A) on VM 1 (202 _(A)) captures flow 1 (F1) and reports F1 to collector 118 as illustrated on FIG. 1. sensor 210 on hypervisor 208 can also observe and capture F1, as F1 would traverse hypervisor 208 when being sent or received by VM 1 (202 _(A)). In addition, sensor 214 on server 106 _(A) can also see and capture F1, as F1 would traverse server 106 _(A) when being sent or received by VM 1 (202 _(A)) and hypervisor 208. Accordingly, sensor 214 can also report F1 to collector 118. Thus, collector 118 can receive a report (i.e., control flow) regarding F1 from sensor 204 _(A) on VM 1 (202 _(A)), sensor 210 on hypervisor 208, and sensor 214 on server 106 _(A).

When reporting F1, server sensor 214 can report F1 as a message or report that is separate from any messages or reports of F1 transmitted by sensor 204 _(A) on VM 1 (202 _(A)) or sensor 210 on hypervisor 208. However, server sensor 214 can also, or otherwise, report F1 as a message or report that includes or appends the messages or reports or metadata of F1 transmitted by sensor 204 _(A) on VM 1 (202 _(A)) and sensor 210 on hypervisor 208. In other words, server sensor 214 can report F1 as a separate message or report from the messages or reports of F1 from sensor 204 _(A) and sensor 210, and/or a same message or report that includes a report of F1 by sensor 204 _(A), sensor 210, and sensor 214. In this way, sensors 204 at VMs 202 can report packets or flows received or sent by VMs 202, sensor 210 at hypervisor 208 can report packets or flows received or sent by hypervisor 208, including any flows or packets received or sent by VMs 202 and reported by sensors 204, and sensor 214 at server 106 _(A) can report packets or flows received or sent by server 106 _(A), including any flows or packets received or sent by VMs 202 and reported by sensors 204, and any flows or packets received or sent by hypervisor 208 and reported by sensor 210.

Server sensor 214 can run as a process, kernel module, or kernel driver on the host operating system or a hardware component of server 106 _(A). Server sensor 214 can thus monitor any traffic sent and received by server 106 _(A), any processes associated with server 106 _(A), etc.

In addition to network data, sensors 204, 210, and 214 can capture additional information about the system or environment in which they reside. For example, sensors 204, 210, and 214 can capture data or metadata of active or previously active processes of their respective system or environment, operating system user identifiers, metadata of files on their respective system or environment, timestamps, network addressing information, flow identifiers, sensor identifiers, etc. Moreover, sensors 204, 210, 214 are not specific to any operating system environment, hypervisor environment, network environment, or hardware environment. Thus, sensors 204, 210, and 214 can operate in any environment.

As previously explained, sensors 204, 210, and 214 can send information about the network traffic they observe. This information can be sent to one or more remote devices, such as one or more servers, collectors, engines, etc. Each sensor can be configured to send respective information using a network address, such as an IP address, and any other communication details, such as port number, to one or more destination addresses or locations. Sensors 204, 210, and 214 can send metadata about one or more flows, packets, communications, processes, events, etc.

Sensors 204, 210, and 214 can periodically report information about each flow or packet they observe. The information reported can contain a list of flows or packets that were active during a period of time (e.g., between the current time and the time at which the last information was reported). The communication channel between the sensor and the destination can create a flow in every interval. For example, the communication channel between sensor 214 and collector 118 can create a control flow. Thus, the information reported by a sensor can also contain information about this control flow. For example, the information reported by sensor 214 to collector 118 can include a list of flows or packets that were active at hypervisor 208 during a period of time, as well as information about the communication channel between sensor 210 and collector 118 used to report the information by sensor 210.

FIG. 2B illustrates a schematic diagram of example sensor deployment 220 in an example network device. The network device is described as leaf router 104 _(A), as illustrated in FIG. 1. However, this is for explanation purposes. The network device can be any other network device, such as any other switch, router, etc.

In this example, leaf router 104 _(A) can include network resources 222, such as memory, storage, communication, processing, input, output, and other types of resources. Leaf router 104 _(A) can also include operating system environment 224. The operating system environment 224 can include any operating system, such as a network operating system, embedded operating system, etc. Operating system environment 224 can include processes, functions, and applications for performing networking, routing, switching, forwarding, policy implementation, messaging, monitoring, and other types of operations.

Leaf router 104 _(A) can also include sensor 226. Sensor 226 can be an agent or sensor configured to capture network data, such as flows or packets, sent received, or processed by leaf router 104 _(A). Sensor 226 can also be configured to capture other information, such as processes, statistics, users, alerts, status information, device information, etc. Moreover, sensor 226 can be configured to report captured data to a remote device or network, such as collector 118 shown in FIG. 1, for example. Sensor 226 can report information using one or more network addresses associated with leaf router 104 _(A) or collector 118. For example, sensor 226 can be configured to report information using an IP assigned to an active communications interface on leaf router 104 _(A).

Leaf router 104 _(A) can be configured to route traffic to and from other devices or networks, such as server 106 _(A). Accordingly, sensor 226 can also report data reported by other sensors on other devices. For example, leaf router 104 _(A) can be configured to route traffic sent and received by server 106 _(A) to other devices. Thus, data reported from sensors deployed on server 106 _(A), such as VM and hypervisor sensors on server 106 _(A), would also be observed by sensor 226 and can thus be reported by sensor 226 as data observed at leaf router 104 _(A). Such report can be a control flow generated by sensor 226. Data reported by the VM and hypervisor sensors on server 106 _(A) can therefore be a subset of the data reported by sensor 226.

Sensor 226 can run as a process or component (e.g., firmware, module, hardware device, etc.) in leaf router 104 _(A). Moreover, sensor 226 can be installed on leaf router 104 _(A) as a software or firmware agent. In some configurations, leaf router 104 _(A) itself can act as sensor 226. Moreover, sensor 226 can run within operating system 224 and/or separate from operating system 224.

FIG. 2C illustrates a schematic diagram of example reporting system 240 in an example sensor topology. Leaf router 104 _(A) can route packets or traffic 242 between fabric 112 and server 106 _(A), hypervisor 108 _(A), and VM 110 _(A). Packets or traffic 242 between VM 110 _(A) and leaf router 104 _(A) can flow through hypervisor 108 _(A) and server 106 _(A). Packets or traffic 242 between hypervisor 108 _(A) and leaf router 104 _(A) can flow through server 106 _(A). Finally, packets or traffic 242 between server 106 _(A) and leaf router 104 _(A) can flow directly to leaf router 104 _(A). However, in some cases, packets or traffic 242 between server 106 _(A) and leaf router 104 _(A) can flow through one or more intervening devices or networks, such as a switch or a firewall.

Moreover, VM sensor 204 _(A) at VM 110 _(A), hypervisor sensor 210 at hypervisor 108 _(A), network device sensor 226 at leaf router 104 _(A), and any server sensor at server 106 _(A) (e.g., sensor running on host environment of server 106 _(A)) can send reports 244 (also referred to as control flows) to collector 118 based on the packets or traffic 242 captured at each respective sensor. Reports 244 from VM sensor 204 _(A) to collector 118 can flow through VM 110 _(A), hypervisor 108 _(A), server 106 _(A), and leaf router 104 _(A). Reports 244 from hypervisor sensor 210 to collector 118 can flow through hypervisor 108 _(A), server 106 _(A), and leaf router 104 _(A). Reports 244 from any other server sensor at server 106 _(A) to collector 118 can flow through server 106 _(A) and leaf router 104 _(A). Finally, reports 244 from network device sensor 226 to collector 118 can flow through leaf router 104 _(A). Although reports 244 are depicted as being routed separately from traffic 242 in FIG. 2C, one of ordinary skill in the art will understand that reports 244 and traffic 242 can be transmitted through the same communication channel(s).

Reports 244 can include any portion of packets or traffic 242 captured at the respective sensors. Reports 244 can also include other information, such as timestamps, process information, sensor identifiers, flow identifiers, flow statistics, notifications, logs, user information, system information, addresses, ports, protocols, etc. Reports 244 may include information about whether the reported device is a server or a client, although such information may be absent in other instances, thereby necessitating a determination of the server-client status based on other information. Some or all of this information can be appended to reports 244 as one or more labels, metadata, or as part of the packet(s)' header, trailer, or payload. For example, if a user opens a browser on VM 110 _(A) and navigates to examplewebsite.com, VM sensor 204 _(A) of VM 110 _(A) can determine which user (i.e., operating system user) of VM 110 _(A) (e.g., username “johndoe85”) and which process being executed on the operating system of VM 110 _(A) (e.g., “chrome.exe”) were responsible for the particular network flow to and from examplewebsite.com. Once such information is determined, the information can be included in report 244 as labels for example, and report 244 can be transmitted from VM sensor 204 _(A) to collector 118. Such additional information can help system 240 to gain insight into flow information at the process and user level, for instance. This information can be used for security, optimization, and determining structures and dependencies within system 240. Moreover, reports 244 can be transmitted to collector 118 periodically as new packets or traffic 242 are captured by a sensor. Further, each sensor can send a single report or multiple reports to collector 118. For example, each of the sensors 116 can be configured to send a report to collector 118 for every flow, packet, message, communication, or network data received, transmitted, and/or generated by its respective host (e.g., VM 110 _(A), hypervisor 108 _(A), server 106 _(A), and leaf router 104 _(A)). As such, collector 118 can receive a report of a same packet from multiple sensors.

For example, a packet received by VM 110 _(A) from fabric 112 can be captured and reported by VM sensor 204 _(A). Since the packet received by VM 110 _(A) will also flow through leaf router 104 _(A) and hypervisor 108 _(A), it can also be captured and reported by hypervisor sensor 210 and network device sensor 226. Thus, for a packet received by VM 110 _(A) from fabric 112, collector 118 can receive a report of the packet from VM sensor 204 _(A), hypervisor sensor 210, and network device sensor 226.

Similarly, a packet sent by VM 110 _(A) to fabric 112 can be captured and reported by VM sensor 204 _(A). Since the packet sent by VM 110 _(A) will also flow through leaf router 104 _(A) and hypervisor 108 _(A), it can also be captured and reported by hypervisor sensor 210 and network device sensor 226. Thus, for a packet sent by VM 110 _(A) to fabric 112, collector 118 can receive a report of the packet from VM sensor 204 _(A), hypervisor sensor 210, and network device sensor 226.

On the other hand, a packet originating at, or destined to, hypervisor 108 _(A), can be captured and reported by hypervisor sensor 210 and network device sensor 226, but not VM sensor 204 _(A), as such packet may not flow through VM 110 _(A). Moreover, a packet originating at, or destined to, leaf router 104 _(A), will be captured and reported by network device sensor 226, but not VM sensor 204 _(A), hypervisor sensor 210, or any other sensor on server 106 _(A), as such packet may not flow through VM 110 _(A), hypervisor 108 _(A), or server 106 _(A).

Each of the sensors 204 _(A), 210, 226 can include a respective unique sensor identifier on each of reports 244 it sends to collector 118, to allow collector 118 to determine which sensor sent the report. Reports 244 can be used to analyze network and/or system data and conditions for troubleshooting, security, visualization, configuration, planning, and management. Sensor identifiers in reports 244 can also be used to determine which sensors reported what flows. This information can then be used to determine sensor placement and topology, as further described below, as well as mapping individual flows to processes and users. Such additional insights gained can be useful for analyzing the data in reports 244, as well as troubleshooting, security, visualization, configuration, planning, and management.

FIG. 3 illustrates a sequence diagram of an example communication between network nodes. In this example communication 300 between node A 302 and node B 304, one or more messages such as messages 1-9 (306-322) may be exchanged between the two nodes. Node A 302 and node B 304 can each be a network node such as any of the devices shown in FIGS. 1 and 2A-2C. Each message can be a piece of electronic data such as a packet in a packet-switched network. Various sensors that are placed in the network can monitor any data traffic that is exchanged between node A 302 and node B 304, such as sensor 1 (324), sensor 2 (326), and sensor 3 (328), and generate reports based on the monitored traffic. As one of ordinary skill in the art will appreciate, more sensors can be used. Sensors 324, 326, 328 can be placed at a client device, a server, a VM, a hypervisor, a switch, a gateway, etc. However, these messages may not explicitly identify either node A 302 or node B 304 as a server or a client in this data exchange. Thus, an entity that collects information from sensors 324, 326, 328 may have to make a determination as to the nodes' server-client status based on other information and determination rules.

In some examples, such determination can be made based on rules about the timings of the various messages exchanged between node A 302 and node B 304. In particular, based on the empirical data and statistics that suggest that a client is more likely than a server to initiate a communication session, it can be surmised that a network node that initiates a communication with another network node is more likely to be the client in that relationship. Thus, when a report is received from a sensor regarding the data traffic exchanged between node A 302 and node B 304, whichever node that is seen to initiate a communication may be more likely to be the client. In example communication 300, node A 302 is seen to initiate a communication with node B 304 by transmitting message 1 (306). If there is a relatively long pause between two messages, such as message 3 (310) and message 3 (312) in this example, the message that comes after the hiatus can be considered a beginning of a separate communication. The existence of such a hiatus can be determined by a threshold. For example, if the threshold time duration is 5 seconds, any message that follows another message after more than 5 seconds can be considered an initiation of another communication session. As one of ordinary skill in the art will understand, this threshold can be any predetermined time duration.

Depending on the various conditions, configurations, capabilities, and limitations of each sensor, sensors 324, 326, 328 may capture different portions of the actual data traffic between nodes 302, 304. For example, sensor 1 (324) can capture messages 1-9 (306-322), but sensor 2 (326) may capture messages 4-6 (312-316) while sensor 3 (328) captures messages 7-8 (318-320). Thus, according to the information reported by sensor 1 (324) and sensor 2 (326), it may be surmised that node A is more likely to be the client because it initiated message 1 (306) and message 4 (312). However, according to the information reported by sensor 3 (328), it may be concluded that node B 304 is the client. There can be various ways to reconcile such discrepancy. In some examples, each sensor can be given a vote and the majority vote can decide the server-client statuses of the nodes. Thus, in example communication 300, it may be concluded that node A 302 is more likely to be the client because two of the three sensors indicate that node A 302 is more likely to initiate communication sessions with node B 304. According to some examples, weights may be assigned to various sensors according to their accuracy, margin of error, length of time of observation, amount of information collected, etc. to give more credence to data gathered from some sensors than others. For example, if one sensor has monitored data traffic between a given pair of network nodes more than other sensors, the information reported by that sensor can be given more weight. In another example, if a certain sensor is known to have provided better indications than other sensors in the past, that sensor can be given more weight. In yet another example, if a certain sensor is only able to observe only one direction of data traffic because of a particular placement of the sensor in the network, then the information reported by that sensor can be down voted or be assigned a lesser weight when making the final determination.

FIG. 4 illustrates a schematic diagram of example nodes with respective degrees of communication. In this example, another rule can be used to determine the server-client statuses of network nodes. In particular, the rule may dictate that the node that has a greater degree of communication is more likely to be the server because servers tend to connect with more devices than the clients. The degree of communication can be defined as the number of unique address-port pair that a given node connects to or communicates with. The address can be an Internet Protocol (IP) address. The address-port pair can be represented as “([address], [port])”. For example, network node 400 having the IP address 1.1.1.1 and communicates via port number 1000 can be represented as (1.1.1.1, 400). According to the information reported by one or more sensors, node 400 is observed to have been in communication with node 402 at (7.7.7.7, 300), node 404 at (2.2.2.2, 500), node 406 at (3.3.3.3, 400), node 408 (4.4.4.4, 1029), node 410 at (5.5.5.5, 1114), and node 412 at (6.6.6.6, 416). Therefore, the degree of communication for node 400 is six. Meanwhile, the sensors report that node 402 at (7.7.7.7, 300) has been in communication with node 414 at (8.8.8.8, 826) and node 416 at (9.9.9.9, 98) as well as node 400. Thus, the degree of communication for node 402 is three. The entity receiving such information from one or more sensors regarding node 400 and node 402 may therefore conclude that node 400 is more likely to be the server and node 402 is more likely to be the client in their relationship because node 400 has a greater degree of communication than node 402 does (i.e., 6>3).

When more than one sensors that monitor node 400 and node 402 report different findings, then various methods similar to the ones illustrated with regards to FIG. 3 may be used to reconcile the differences. For example, weighted or unweighted votes may be taken among the sensors to draw the overall conclusion.

Still other rules can be used to make the determination as to which node is the client and which node is the server. In some examples, the magnitude of the port can be used as one of the deciding factors. For example, when the statistics suggests that servers tend to use lower number ports than the clients for Transmission Control Protocol (TCP) and User Datagram Protocol (UDP), then the determination can be made based on the magnitudes of the port numbers used by the nodes. Specifically, if the first node is seen to use port 1200 and the second node is seen to use port 23000, then it may be determined that the first node is more likely to be the server and the second node is more likely to be the client. Well-known port numbers may also be taken into account. For example, if a node is using one of ports 20 (i.e., File Transfer Protocol (FTP)), 23 (i.e., Telnet protocol), 80 (i.e., Hypertext Transfer Protocol (HTTP)), etc., then it may be determined that the node is likely a server.

FIGS. 5A-5C illustrate yet another rule by which server-client statuses of network nodes may be determined. In particular, schematic diagrams of FIGS. 5A-5C show example nodes and how information may propagate throughout graph 500. Graph 500 can be created based on the information that is collected from one or more sensors deployed throughout the network. Nodes 502-522 represent individual network nodes in the network and the edges that connect the nodes represent network connections or communications between those nodes. However, the server-client statuses of nodes 502-522 may not be known. Once the statuses of one or more nodes are determined by using any of the methods and rules described in this disclosure, that information can be propagated through the rest of graph 500 according to the graph consistency rule. According to this rule, if two nodes are known to have communicated with each other in the past and one of the nodes is determined to be a server, then we may conclude that the remaining node is a client in that particular relationship. By the same token, if one of the nodes is found to be the client, then it may be concluded that the other node is the server because two ends of a communication generally cannot be both clients or both servers.

In general, determination as to the server-client status may be associated with a certain degree of confidence. This information about confidence level can be also propagated (i.e., via “belief propagation” and techniques for Markov random fields), especially if the classifier provides confidences in the form of probabilities. When inconsistencies or errors arise when information is propagated through the graph, the user can be notified to adjudicate whether the node in question is a client or a server. In rare occasions and/or over a long time duration, the same address-port pair can be seen as both server and client such as when the node transitions from one to another over a period of time. In such cases, separate graphs can be generated for different time periods and have them influence each other.

In FIG. 5A, it has been determined that node 502 is a server and node 504 is a client. By using the graph consistency rule, this information may be propagated through the rest of the nodes. In FIG. 5B, the information has propagated to the immediate neighbors of node 502 and node 504 according to the graph consistency rule. In particular, nodes 506, 508, 510 have been determined to be clients since node 502 is a server. Similarly, it may be determined that nodes 512, 514 are servers since node 504 has been determined to be a client. In FIG. 5C, the information continues to spread throughout graph 500. Particularly, we may now conclude that node 516 is a server because node 506 is a client. Likewise, we may determine that nodes 518, 520, 522 are clients because their immediate neighbors—node 512 and node 514—are servers.

In addition, machine learning can be used to better predict the server-client statuses of network nodes. In particular, the machine-learned classifiers and/or hard-coded rules can be used to determine which end of an IP-port pair is the server and which end is the client. In some examples, known connections (i.e., known server and client addresses and ports) can be used to train machine-learned classifiers using the features derived from these connections. This can be done, for example, by supervised learning, where for a given connection involving a pair of address-port pairs, multiple sources of evidence (e.g., magnitude, degree, timing, etc.) can be gathered via learning a classifier (e.g., a linear classifier such as logistic regression, perceptron, or a non-linear classifier such as decision tree, random forest, neural network). Historical data can be used for the training purposes. In particular, past TCP connections can provide the requisite data because with these connections, the server-client identifications may be explicitly made known. For each known case, we may create a vector of feature values. consisting of features such as a ratio of port magnitude of the two endpoints, a difference in port magnitude, a ratio of degree, a ratio of time the port is mostly used as a server historically, etc. The label of the vector may indicate which end is the server. We may then train a classifier and perform a series of machine learning tasks, such as cross-validation, in order to figure out the error rate of the classifier.

As one of skill in the art will appreciate, some of all of the various methods and rules—timing, degree, magnitude, graph consistency, historical data, machine learning, etc.—as described in this disclosure can be used in combination. Different weights can also be assigned to different rules and methods depending on the accuracy, margin of error, etc. of each rule or method.

Having disclosed some basic system components and concepts, the disclosure now turns to the exemplary method examples shown in FIGS. 6-8. For the sake of clarity, the methods are described in terms of system 100, as shown in FIG. 1, configured to practice the method. However, the example methods can be practiced by any software or hardware components, devices, etc. heretofore disclosed, such as system 200 of FIG. 2A, system 220 of FIG. 2B, system 9 of FIG. 9, system 1000 of FIG. 10A, system 1050 of FIG. 10B, etc. The steps outlined herein are exemplary and can be implemented in any combination thereof in any order, including combinations that exclude, add, or modify certain steps.

In FIG. 6, system 100 can collect, from a sensor that monitors at least part of data traffic exchanged between a pair of nodes in a network, information about the data traffic, the pair of nodes comprising a first node and a second node (602). The sensor can be located at the first node, the second node, or a network node different from the first node and the second node. The network node can be an endpoint, a terminal, a server, a virtual machine, a hypervisor, a switch, a gateway, etc. Based on the information, system 100 can estimate which node of the pair of nodes initiated the data traffic, to yield an estimation (604). System 100 can also collect additional information from a second sensor that monitors at least part of the data traffic exchanged between the pair of nodes, and the estimation can be further based on this additional information. Information from the two sensors can be weighted with a respective weight for the estimation, and the respective weight can be determined based on one or more of a length of time, an amount of information, or a margin of error, etc., associated with monitoring of the data traffic by the corresponding sensor. The information can also be collected from three or more sensors.

When the estimation indicates that the first node initiated the data traffic, system 100 can determine that the first node is a client and that the second node is a server (606). Additionally, system 100 can create a graph that includes the first node, the second node, and a third node in the network. System 100 can receive an indication that the second node has communicated with the third node, and upon determining that the second node is the client, system 100 can determine, based on the indication, that the third node is also a server. Likewise, the determination regarding the server-client status of the first node, the second node, and/or the third node can be further propagated throughout the graph, where the graph may have a plurality of nodes other than the first node, the second node, and the third node. Moreover, based on the determination, system 100 can perform machine learning to determine server-client statuses of other nodes in the network. The machine learning can be supervised learning, and the estimation and the determination can be used as training data for the supervised learning. For example, the machine learning can be based on a decision tree, a random forest, a neural network, a random forest, etc.

In FIG. 7, system 100 can collect, from a sensor that monitors at least part of data traffic being transmitted via a pair of nodes in a network, information about the data traffic, the pair of nodes comprising a first node and a second node (702). The sensor can be located at the first node, the second node, or a network node different from the first node and the second node. The network node can be an endpoint, a terminal, a server, a virtual machine, a hypervisor, a switch, a gateway, etc. Based on the information, system 100 can estimate a first degree of connection for the first node and a second degree of connection for the second node, to yield an estimation, wherein the first degree of connection indicates how many unique address-port pairs that the first node has communicated with, and wherein the second degree of connection indicates how many unique address-port pairs that the second node has communicated with (704). Each of the unique address-port pairs can be an Internet protocol address and a port number. System 100 can also collect additional information from a second sensor that monitors at least part of the data traffic exchanged between the pair of nodes, and the estimation can be further based on this additional information. Information from the two sensors can be weighted with a respective weight for the estimation, and the respective weight can be determined based on one or more of a length of time, an amount of information, or a margin of error, etc., associated with monitoring of the data traffic by the corresponding sensor. The information can also be collected from three or more sensors.

When the estimation indicates that the first degree of connection is greater than the second degree of connection, system 100 can determine that the first node is a server and that the second node is a client (706). Additionally, system 100 can create a graph that includes the first node, the second node, and a third node in the network. System 100 can receive an indication that the second node has communicated with the third node, and upon determining that the second node is the client, system 100 can determine, based on the indication, that the third node is also a server. Likewise, the determination regarding the server-client status of the first node, the second node, and/or the third node can be further propagated throughout the graph, where the graph may have a plurality of nodes other than the first node, the second node, and the third node. Moreover, based on the determination, system 100 can perform machine learning to determine server-client statuses of other nodes in the network. The machine learning can be supervised learning, and the estimation and the determination can be used as training data for the supervised learning. For example, the machine learning can be based on a decision tree, a random forest, a neural network, a random forest, etc.

In FIG. 8, system 100 can collect, from a sensor that monitors at least part of data traffic being transmitted via a pair of nodes in a network, information about the data traffic (802). The sensor can be located at the first node, the second node, or a network node different from the first node and the second node. The network node can be an endpoint, a terminal, a server, a virtual machine, a hypervisor, a switch, a gateway, etc. Based on the information, system 100 can analyze timings of communication for the pair of nodes and degrees of communication for the pair of nodes, to yield an analysis (804). System 100 can also collect additional information from a second sensor that monitors at least part of the data traffic exchanged between the pair of nodes, and the estimation can be further based on this additional information. Information from the two sensors can be weighted with a respective weight for the estimation, and the respective weight can be determined based on one or more of a length of time, an amount of information, or a margin of error, etc., associated with monitoring of the data traffic by the corresponding sensor. The information can also be collected from three or more sensors. These additional sensors can collect and report information about timing, degree, magnitude, graph consistency, etc. with regards to the monitored nodes.

Based on the analysis and a predetermined rule associated with the timings of communication and the degrees of communication, system 100 can determine which node of the pair of nodes is a client and which node of the pair of nodes is a server (806). Additionally, system 100 can create a graph that includes the first node, the second node, and a third node in the network. System 100 can receive an indication that the second node has communicated with the third node, and upon determining that the second node is the client, system 100 can determine, based on the indication, that the third node is also a server. Likewise, the determination regarding the server-client status of the first node, the second node, and/or the third node can be further propagated throughout the graph, where the graph may have a plurality of nodes other than the first node, the second node, and the third node. Moreover, based on the determination, system 100 can perform machine learning to determine server-client statuses of other nodes in the network. The machine learning can be supervised learning, and the estimation and the determination can be used as training data for the supervised learning. For example, the machine learning can be based on a decision tree, a random forest, a neural network, a random forest, etc.

Example Devices

FIG. 9 illustrates an example network device 1010 according to some examples. Network device 1010 includes a master central processing unit (CPU) 902, interfaces 904, and a bus 906 (e.g., a PCI bus). When acting under the control of appropriate software or firmware, the CPU 902 is responsible for executing packet management, error detection, and/or routing functions. The CPU 902 preferably accomplishes all these functions under the control of software including an operating system and any appropriate applications software. CPU 902 may include one or more processors 910 such as a processor from the Motorola family of microprocessors or the MIPS family of microprocessors. In an alternative embodiment, processor 910 is specially designed hardware for controlling the operations of router 1010. In a specific embodiment, a memory 908 (such as non-volatile RAM and/or ROM) also forms part of CPU 902. However, there are many different ways in which memory could be coupled to the system.

The interfaces 904 are typically provided as interface cards (sometimes referred to as “line cards”). Generally, they control the sending and receiving of data packets over the network and sometimes support other peripherals used with the router 1010. Among the interfaces that may be provided are Ethernet interfaces, frame relay interfaces, cable interfaces, DSL interfaces, token ring interfaces, and the like. In addition, various very high-speed interfaces may be provided such as fast token ring interfaces, wireless interfaces, Ethernet interfaces, Gigabit Ethernet interfaces, ATM interfaces, HSSI interfaces, POS interfaces, FDDI interfaces and the like. Generally, these interfaces may include ports appropriate for communication with the appropriate media. In some cases, they may also include an independent processor and, in some instances, volatile RAM. The independent processors may control such communications intensive tasks as packet switching, media control and management. By providing separate processors for the communications intensive tasks, these interfaces allow the master microprocessor 902 to efficiently perform routing computations, network diagnostics, security functions, etc.

Although the system shown in FIG. 9 is one specific network device of the present invention, it is by no means the only network device architecture on which the present invention can be implemented. For example, an architecture having a single processor that handles communications as well as routing computations, etc. is often used. Further, other types of interfaces and media could also be used with the router.

Regardless of the network device's configuration, it may employ one or more memories or memory modules (including memory 908) configured to store program instructions for the general-purpose network operations and mechanisms for roaming, route optimization and routing functions described herein. The program instructions may control the operation of an operating system and/or one or more applications, for example. The memory or memories may also be configured to store tables such as mobility binding, registration, and association tables, etc.

FIG. 10A and FIG. 10B illustrate example system examples. The more appropriate embodiment will be apparent to those of ordinary skill in the art when practicing the present technology. Persons of ordinary skill in the art will also readily appreciate that other system examples are possible.

FIG. 10A illustrates a conventional system bus computing system architecture 1000 wherein the components of the system are in electrical communication with each other using a bus 1012. Exemplary system 1000 includes a processing unit (CPU or processor) 1002 and a system bus 1012 that couples various system components including the system memory 1006, such as read only memory (ROM) 1008 and random access memory (RAM) 1010, to the processor 1002. The system 1000 can include a cache of high-speed memory connected directly with, in close proximity to, or integrated as part of the processor 1002. The system 1000 can copy data from the memory 1006 and/or the storage device 1020 to the cache 1004 for quick access by the processor 1002. In this way, the cache can provide a performance boost that avoids processor 1002 delays while waiting for data. These and other modules can control or be configured to control the processor 1002 to perform various actions. Other system memory 1006 may be available for use as well. The memory 1006 can include multiple different types of memory with different performance characteristics. The processor 1002 can include any general purpose processor and a hardware module or software module, such as module 1 (1022), module 2 (1024), and module 3 (1026) stored in storage device 1020, configured to control the processor 1002 as well as a special-purpose processor where software instructions are incorporated into the actual processor design. The processor 1002 may essentially be a completely self-contained computing system, containing multiple cores or processors, a bus, memory controller, cache, etc. A multi-core processor may be symmetric or asymmetric.

To enable user interaction with the computing device 1000, an input device 1014 can represent any number of input mechanisms, such as a microphone for speech, a touch-sensitive screen for gesture or graphical input, keyboard, mouse, motion input, speech and so forth. An output device 1016 can also be one or more of a number of output mechanisms known to those of skill in the art. In some instances, multimodal systems can enable a user to provide multiple types of input to communicate with the computing device 1000. The communications interface 1018 can generally govern and manage the user input and system output. There is no restriction on operating on any particular hardware arrangement and therefore the basic features here may easily be substituted for improved hardware or firmware arrangements as they are developed.

Storage device 1020 is a non-volatile memory and can be a hard disk or other types of computer readable media which can store data that are accessible by a computer, such as magnetic cassettes, flash memory cards, solid state memory devices, digital versatile disks, cartridges, random access memories (RAMs) 1010, read only memory (ROM) 1008, and hybrids thereof.

The storage device 1020 can include software modules 1022, 1024, 1026 for controlling the processor 1002. Other hardware or software modules are contemplated. The storage device 1020 can be connected to the system bus 1012. In one aspect, a hardware module that performs a particular function can include the software component stored in a computer-readable medium in connection with the necessary hardware components, such as the processor 1002, bus 1012, display 1016, and so forth, to carry out the function.

FIG. 10B illustrates an example computer system 1050 having a chipset architecture that can be used in executing the described method and generating and displaying a graphical user interface (GUI). Computer system 1050 is an example of computer hardware, software, and firmware that can be used to implement the disclosed technology. System 1050 can include a processor 1052, representative of any number of physically and/or logically distinct resources capable of executing software, firmware, and hardware configured to perform identified computations. Processor 1052 can communicate with a chipset 1054 that can control input to and output from processor 1052. In this example, chipset 1054 outputs information to output device 1056, such as a display, and can read and write information to storage device 1058, which can include magnetic media, and solid state media, for example. Chipset 1054 can also read data from and write data to RAM 1060. A bridge 1062 for interfacing with a variety of user interface components 1064 can be provided for interfacing with chipset 1054. Such user interface components 1064 can include a keyboard, a microphone, touch detection and processing circuitry, a pointing device, such as a mouse, and so on. In general, inputs to system 1050 can come from any of a variety of sources, machine generated and/or human generated.

Chipset 1054 can also interface with one or more communication interfaces 1066 that can have different physical interfaces. Such communication interfaces can include interfaces for wired and wireless local area networks, for broadband wireless networks, as well as personal area networks. Some applications of the methods for generating, displaying, and using the GUI disclosed herein can include receiving ordered datasets over the physical interface or be generated by the machine itself by processor 1052 analyzing data stored in storage 1058 or 1060. Further, the machine can receive inputs from a user via user interface components 1064 and execute appropriate functions, such as browsing functions by interpreting these inputs using processor 1052.

It can be appreciated that example systems 1000 and 1050 can have more than one processor 1002 or be part of a group or cluster of computing devices networked together to provide greater processing capability.

For clarity of explanation, in some instances the present technology may be presented as including individual functional blocks including functional blocks comprising devices, device components, steps or routines in a method embodied in software, or combinations of hardware and software.

In some examples the computer-readable storage devices, mediums, and memories can include a cable or wireless signal containing a bit stream and the like. However, when mentioned, non-transitory computer-readable storage media expressly exclude media such as energy, carrier signals, electromagnetic waves, and signals per se.

Methods according to the above-described examples can be implemented using computer-executable instructions that are stored or otherwise available from computer readable media. Such instructions can comprise, for example, instructions and data which cause or otherwise configure a general purpose computer, special purpose computer, or special purpose processing device to perform a certain function or group of functions. Portions of computer resources used can be accessible over a network. The computer executable instructions may be, for example, binaries, intermediate format instructions such as assembly language, firmware, or source code. Examples of computer-readable media that may be used to store instructions, information used, and/or information created during methods according to described examples include magnetic or optical disks, flash memory, USB devices provided with non-volatile memory, networked storage devices, and so on.

Devices implementing methods according to these disclosures can comprise hardware, firmware and/or software, and can take any of a variety of form factors. Typical examples of such form factors include laptops, smart phones, small form factor personal computers, personal digital assistants, rackmount devices, standalone devices, and so on. Functionality described herein also can be embodied in peripherals or add-in cards. Such functionality can also be implemented on a circuit board among different chips or different processes executing in a single device, by way of further example.

The instructions, media for conveying such instructions, computing resources for executing them, and other structures for supporting such computing resources are means for providing the functions described in these disclosures.

Although a variety of examples and other information was used to explain aspects within the scope of the appended claims, no limitation of the claims should be implied based on particular features or arrangements in such examples, as one of ordinary skill would be able to use these examples to derive a wide variety of implementations. Further and although some subject matter may have been described in language specific to examples of structural features and/or method steps, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to these described features or acts. For example, such functionality can be distributed differently or performed in components other than those identified herein. Rather, the described features and steps are disclosed as examples of components of systems and methods within the scope of the appended claims. Moreover, claim language reciting “at least one of” a set indicates that one member of the set or multiple members of the set satisfy the claim.

It should be understood that features or configurations herein with reference to one embodiment or example can be implemented in, or combined with, other examples or examples herein. That is, terms such as “embodiment”, “variation”, “aspect”, “example”, “configuration”, “implementation”, “case”, and any other terms which may connote an embodiment, as used herein to describe specific features or configurations, are not intended to limit any of the associated features or configurations to a specific or separate embodiment or examples, and should not be interpreted to suggest that such features or configurations cannot be combined with features or configurations described with reference to other examples, variations, aspects, examples, configurations, implementations, cases, and so forth. In other words, features described herein with reference to a specific example (e.g., embodiment, variation, aspect, configuration, implementation, case, etc.) can be combined with features described with reference to another example. Precisely, one of ordinary skill in the art will readily recognize that the various examples or examples described herein, and their associated features, can be combined with each other.

A phrase such as an “aspect” does not imply that such aspect is essential to the subject technology or that such aspect applies to all configurations of the subject technology. A disclosure relating to an aspect may apply to all configurations, or one or more configurations. A phrase such as an aspect may refer to one or more aspects and vice versa. A phrase such as a “configuration” does not imply that such configuration is essential to the subject technology or that such configuration applies to all configurations of the subject technology. A disclosure relating to a configuration may apply to all configurations, or one or more configurations. A phrase such as a configuration may refer to one or more configurations and vice versa. The word “exemplary” is used herein to mean “serving as an example or illustration.” Any aspect or design described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects or designs. Moreover, claim language reciting “at least one of” a set indicates that one member of the set or multiple members of the set satisfy the claim. 

What is claimed is:
 1. A method comprising: receiving, from a sensor that monitors at least part of data traffic exchanged between a pair of nodes in a network, information of the data traffic, the pair of nodes comprising a first node and a second node; determining, based on the information, that the first node is a client and that the second node is a server; creating one or more classifiers of servers and clients in the network from the result of the determining; generating at least a first communication graph for the network, the first communication graph comprising the first node, the second node, and one or more other nodes; and based on the one or more classifiers of servers and clients in the network, assigning one or more of the one or more classifiers of servers or clients to the one or more other nodes.
 2. The method of claim 1, wherein the determining is further based on one or more rules associated with timing, port magnitude, degree of communication, or historical data obtained from the information.
 3. The method of claim 1, further comprising: associating a weight with the sensor, the weight based on one or more of accuracy, margin of error, length of time of observation, or amount of information collected by the sensor, wherein the information of the data traffic reported by the sensor is weighted using the weight.
 4. The method of claim 1, further comprising: generating at least a second communication graph for the network, the first communication graph and the second communication graph associated with a first time period and a second time period, respectively.
 5. The method of claim 4, further comprising: determining combined influences between the first communication graph and the second communication graph.
 6. The method of claim 1, further comprising: determining confidence levels associated with the classifiers of servers and clients in the network; and propagating the confidence levels to one or more of the first node, the second node, or the one or more other nodes.
 7. A system, comprising: one or more processors; and a non-transitory computer-readable storage medium containing instructions which, when executed on the one or more processors, cause the one or more processors to perform operations including: receiving, from a sensor that monitors at least part of data traffic exchanged between a pair of nodes in a network, information of the data traffic, the pair of nodes comprising a first node and a second node; determining, based on the information, that the first node is a client and that the second node is a server; creating one or more classifiers of servers and clients in the network from the result of the determining; generating at least a first communication graph for the network, the first communication graph comprising the first node, the second node, and one or more other nodes; and based on the one or more classifiers of servers and clients in the network, assigning one or more of the one or more classifiers of servers or clients to the one or more other nodes.
 8. The system of claim 7, wherein the determining is further based on one or more rules associated with timing, port magnitude, degree of communication, or historical data obtained from the information.
 9. The system of claim 7, wherein the operations further comprise: associating a weight with the sensor, the weight based on one or more of accuracy, margin of error, length of time of observation, or amount of information collected by the sensor, wherein the information of the data traffic reported by the sensor is weighted using the weight.
 10. The system of claim 7, wherein the operations further comprise: generating at least a second communication graph for the network, the first communication graph and the second communication graph associated with a first time period and a second time period, respectively.
 11. The system of claim 10, wherein the operations further comprise: determining combined influences between the first communication graph and the second communication graph.
 12. The system of claim 7, wherein the operations further comprise: determining confidence levels associated with the classifiers of servers and clients in the network; and propagating the confidence levels to one or more of the first node, the second node, or the one or more other nodes.
 13. A non-transitory machine-readable storage medium, including instructions configured to cause a data processing apparatus to perform operations including: receiving, from a sensor that monitors at least part of data traffic exchanged between a pair of nodes in a network, information of the data traffic, the pair of nodes comprising a first node and a second node; determining, based on the information, that the first node is a client and that the second node is a server; creating one or more classifiers of servers and clients in the network from the result of the determining; generating at least a first communication graph for the network, the first communication graph comprising the first node, the second node, and one or more other nodes; and based on the one or more classifiers of servers and clients in the network, assigning one or more of the one or more classifiers of servers or clients to the one or more other nodes.
 14. The non-transitory machine-readable storage medium of claim 13, wherein the determining is further based on one or more rules associated with timing, port magnitude, degree of communication, or historical data obtained from the information.
 15. The non-transitory machine-readable storage medium of claim 14, wherein the operations further comprise: associating a weight with the sensor, the weight based on one or more of accuracy, margin of error, length of time of observation, or amount of information collected by the sensor, wherein the information of the data traffic reported by the sensor is weighted using the weight.
 16. The non-transitory machine-readable storage medium of claim 13, wherein the operations further comprise: generating at least a second communication graph for the network, the first communication graph and the second communication graph associated with a first time period and a second time period, respectively.
 17. The non-transitory machine-readable storage medium of claim 13, wherein the operations further comprise: determining confidence levels associated with the classifiers of servers and clients in the network; and propagating the confidence levels to one or more of the first node, the second node, or the one or more other nodes. 